Regensburg 2010 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 24: Turbulence and wind energy

DY 24.8: Vortrag

Donnerstag, 25. März 2010, 11:45–12:00, H47

Dynamic alignment in supersonic compressible MHD turbulence — •Christoph Beetz, Jürgen Dreher, and Rainer Grauer — Institut für Theor. Physik I, Ruhr-Universität Bochum

It is fairly known that in compressible MHD turbulence the compressibility remains on a very low level although the supersonic, turbulent motion of the gas develops strong shocks which are a typical property of compressible flows. Following an idea of Boldyrev (2005) for incompressible turbulence, we investigate the possibility of a dynamical alignment of the velocity- and the magnetic field. Such a non-perfect scale-dependent alignment would on the one hand explain the quasi-incompressibility of the velocity, admitting on the other hand shock formation in the density. To address this question, high resolution numerical simulations of compressible, supersonic MHD-turbulence with a strong background magnetic field were performed with our framework racoon.